HostGuardian
Server port monitoring, content checking, host process verification, and router latency/packet loss monitoring.
InternetCM
Online service which allows you to specify Internet resources, web sites, or keywords that you want monitored.
InternetSeer
Remotely monitors Web sites and provides alerts by email or pager email when sites becomes unavailable. Free limited option available.
IPWatcher.com
Sends email or instant message notification of website service outages.
Mercury SiteScope
Providing application performance, configuration management and network monitoring software solutions.
Netmon
Application that monitors your site through code that you place on your web page. Free version available.
NetWhistle
Advanced web site monitoring service which tests website availability from worldwide network of servers. Includes extensive reports for web site performance, downtime, ssl, http, smtp, pop3 server monitoring, and instant alerts.
Nexus Watch
Monitors availability and performance of web sites, dns, and ftp, including web content checking.
NMSalert
Checks websites every five minutes and lets the client know if there are problems by eMail, fax, or SMS. Free trial available.
PingALink
PingALink monitors each of your servers 12 times an hour, 24/7, and alerts you to their status by email, pager, cell phone, PDA or ICQ.
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